fly drag coefficient

2005-06-04· The thing should fly on about 25W/lb very effectively at those sorts of speeds with a relatively inefficient power train. Checkout GWS LPS power systems and the other things like Knight and Pridham motors etc that the indoor guys use.

The drag coefficient takes into account the shape of the rocket. It is a unitless number, so it may be hard to understand. This number is a combination of several factors, which are: form drag, induced drag, and skin friction drag. Form drag is due to the shape of the rocket. For example, a rounded shape has less drag than a blunt shape, because the air flows over the surface easier. This is ...

Its aspect ratio is 19, and with all the protrusions I would guess the zero-lift drag coefficient to be no less than 0.025. This means the optimum lift coefficient for loiter is close to 2, which is probably above the maximum lift coefficient of the wing airfoil.

Exciting, and a Real Joy to Fly! NEW! CP Airflow Drag No Rotation When the rocket is at any angle-of-attack, such that the air is coming off to one side, like a gust of wind hitting the rocket, then a sudden lift force is created. Airflow Drag Lift Airflow L1 Lift When the Lift force is multiplied by the distance L1, it creates what is called a "pitch moment". This is what causes the ...

measurements, it is relatively easy to get an actual and accurate Drag Coefficient value with just a single flight. While these altimeters cost approximately $100, the savings in rocket motors could easily justify the expense.

2007-03-10· As I understand it, aspect ratio is dominating with respect to the dimensionless drag coefficient Cd. However, if one considers dimensioned drag, it mainly depends on lift, span and the spanwise lift distribution (elliptical for minimum drag).

The drag coefficient, analgous to the lift coefficent, is a measure of the amount of dynamic pressure gets converted into drag. Unlike the lift coefficient however, engineers usually design the drag coefficient to be as low as possible. Low drag coefficients are desirable because an aircraft's efficiency increases as drag decreases.

The Draw Bar Disc Drag Perhaps the most common drag in modern reels is the draw bar disc drag. In this system two or more circular discs are compressed against each other, and at least one of the discs can rotate only one direction.

2014-02-19· With the above equations and knowing the geometry of your aircraft, the parasite drag coefficient can be calculated from the following equation. For each component, you take the product of the three components, divided by the wing planform area, and sum them all up.

Particle Size Effect on the Filtration Drag of Fly Ash from a Coal Power Plant ... The cake resistance coefficient was analyzed by the equation proposed by Endo et al. [1998] in order to observe the effect of particle size and polydispersity. The filtration drag was measured for three kinds of particle stream having the geometric mean particle size of 3.15, 6.07, and 7.83µm and the geometric ...

The faster an aircraft needs to fly the more drag there is and the more streamlined the fuselage needs to be, look at 'Concorde' for an example of this, compared to a 747. The more gradual the aircraft pushes the air aside the less drag it experiences, similar to cutting butter with a knife as apposed to a pencil.

The drag coefficient depends on many factors and, as shown in the formula given in Peter's answer, is not proportional to the thickness. The drag coefficient's thickness dependency however, can be assumed to be proportional to the thickness: the $delta^4$ term is one order of magnitude smaller than the term multiplied with $delta$.

Coefficient simply means a value that is constant or predictable, and in this case it is by virtue of the shape and design of the airfoil—the coefficient (whether for drag or lift) will vary with the angle of attack of the airfoil. Therefore, think of CL or CD as "angle of attack". Note, however, that the rest of the equation is the same for both lift and drag, and further note that air ...

2015-05-05· The drag coefficient is a dimensionless number that characterizes all of the complex factors that affect drag. The drag coefficient is usually determined experimentally using a model in a wind tunnel. In the tunnel, the velocity, density, and size of the model are known. Measuring the drag then determines the value of the drag coefficient as given by the above equation. The drag coefficient ...

Where F D is Drag Force C is the Drag Coefficient of the object. p is the Fluid Density. A is the frontal area. And V is the velocity. Of course I am not particularly interested in the actual drag force, just the relationship between area, current speed and drag. So with my limited mathematical capabilities it would appear that the relationship between drag and area is linear. The more area ...

2015-03-01· 1. where ρ is air density, S is wing surface area, C L is a non-dimensional lift coefficient. Characteristics of the wing, such as thickness, camber and surface texture are included in the lift coefficient, which is a measure of the capacity of the wing to generate lift.

The drag coefficient can depend upon velocity, but we will assume that it is a constant here. Table 2 lists some typical drag coefficients for a variety of objects. Notice that the drag coefficient is a dimensionless quantity.

The effect of arrow or bullet shape (feathers, nock, point angle) on the drag are incorporated in the drag coefficient. Projectiles with lower drag coefficients are more aerodynamic. Values of C d for a range of objects are listed in the table below and make intuitive sense.

Drag coefficient C d for a sphere as a function of Reynolds number Re, as obtained from laboratory experiments. The dark line is for a sphere with a smooth surface, while the lighter line is for the case of a rough surface. Drag depends on the properties of the fluid and on the size, shape, and speed of the object. One way to express this is by means of the drag equation: = where is the drag ...

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